1128 



Subsurface Geologic Methods 



Threads for std. PK type 



""'A' '''^'" '"°'^ ''°'' ^^^ ^'^^ ^ ^^ 

 — ^ dr'll rod.usePKteN adopter. 



w,0u1'er barrel heod 



4 - ^ in Water passages 



- 4 -^ in. Vents 



Greose retainers 



Upper bearing 



'"---Lower bearing Lc... .. .yi". . . .jj 



— ---Grecse retomers V"JEW A-A 



Hollow thrust beoring slioft 

 holes for spanner wrench --Soldered lap 



Inner borrel head 



Cage 

 Steel 

 Rubber 



Liner head 



-Outer barrel 



linner barrel 



5'^O.D. ->• 

 LINEH 

 28 GA SHEET METAL 



Liner 



O0I7 



.---Outer borrel shoe 



- Spring core catcher 



SPRING CORE CATCHER 

 -Cutting teeth 



-Irmer barrel shoe 



Figure 593. Denison double-tube core barrel, designated by H. L. Johnson, U. S. 

 Engineer Office, Denison, Texas, October 1939. 



